diff --git a/build/source_list.bzl b/build/source_list.bzl
index 1329e37..ebc17ad 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -1825,7 +1825,6 @@
     "blind_sign_auth/cached_blind_sign_auth_test.cc",
 ]
 protobuf_blind_sign_auth = [
-    "blind_sign_auth/proto/any.proto",
     "blind_sign_auth/proto/attest_and_sign.proto",
     "blind_sign_auth/proto/attestation.proto",
     "blind_sign_auth/proto/auth_and_sign.proto",
diff --git a/build/source_list.gni b/build/source_list.gni
index a851de2..0bc2ac7 100644
--- a/build/source_list.gni
+++ b/build/source_list.gni
@@ -1831,7 +1831,6 @@
     "src/quiche/blind_sign_auth/cached_blind_sign_auth_test.cc",
 ]
 protobuf_blind_sign_auth = [
-    "src/quiche/blind_sign_auth/proto/any.proto",
     "src/quiche/blind_sign_auth/proto/attest_and_sign.proto",
     "src/quiche/blind_sign_auth/proto/attestation.proto",
     "src/quiche/blind_sign_auth/proto/auth_and_sign.proto",
diff --git a/build/source_list.json b/build/source_list.json
index 5c9c47b..1b3cbe7 100644
--- a/build/source_list.json
+++ b/build/source_list.json
@@ -1830,7 +1830,6 @@
     "quiche/blind_sign_auth/cached_blind_sign_auth_test.cc"
   ],
   "protobuf_blind_sign_auth": [
-    "quiche/blind_sign_auth/proto/any.proto",
     "quiche/blind_sign_auth/proto/attest_and_sign.proto",
     "quiche/blind_sign_auth/proto/attestation.proto",
     "quiche/blind_sign_auth/proto/auth_and_sign.proto",
diff --git a/quiche/blind_sign_auth/blind_sign_auth.cc b/quiche/blind_sign_auth/blind_sign_auth.cc
index 1c13313..de86473 100644
--- a/quiche/blind_sign_auth/blind_sign_auth.cc
+++ b/quiche/blind_sign_auth/blind_sign_auth.cc
@@ -53,7 +53,7 @@
 constexpr std::array<const uint16_t, kExpectedExtensionTypesSize>
     kExpectedExtensionTypes = {0x0001, 0x0002, 0xF001, 0xF002, 0xF003};
 
-using quiche::protobuf::Any;
+using google::protobuf::Any;
 using privacy::ppn::AndroidAttestationData;
 using privacy::ppn::AttestAndSignRequest;
 using privacy::ppn::AttestAndSignResponse;
diff --git a/quiche/blind_sign_auth/blind_sign_auth_protos.h b/quiche/blind_sign_auth/blind_sign_auth_protos.h
index d3cc3f2..25fa62d 100644
--- a/quiche/blind_sign_auth/blind_sign_auth_protos.h
+++ b/quiche/blind_sign_auth/blind_sign_auth_protos.h
@@ -1,8 +1,8 @@
 #ifndef QUICHE_BLIND_SIGN_AUTH_BLIND_SIGN_AUTH_PROTOS_H_
 #define QUICHE_BLIND_SIGN_AUTH_BLIND_SIGN_AUTH_PROTOS_H_
 
-#include "quiche/blind_sign_auth/proto/any.pb.h"        // IWYU pragma: export
-#include "anonymous_tokens/proto/anonymous_tokens.pb.h"  // IWYU pragma: export
+#include "google/protobuf/any.pb.h"        // IWYU pragma: export
+#include "google/protobuf/timestamp.pb.h"  // IWYU pragma: export
 #include "quiche/blind_sign_auth/proto/attestation.pb.h"  // IWYU pragma: export
 #include "quiche/blind_sign_auth/proto/attest_and_sign.pb.h"  // IWYU pragma: export
 #include "quiche/blind_sign_auth/proto/auth_and_sign.pb.h"  // IWYU pragma: export
diff --git a/quiche/blind_sign_auth/proto/any.proto b/quiche/blind_sign_auth/proto/any.proto
deleted file mode 100644
index 59e3eaf..0000000
--- a/quiche/blind_sign_auth/proto/any.proto
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2023 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-syntax = "proto3";
-
-package quiche.protobuf;
-
-option java_multiple_files = true;
-option java_package = "com.google.privacy.ppn.proto";
-
-// Cloned from
-// https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/any.proto.
-message Any {
-  string type_url = 1;
-
-  // Must be a valid serialized protocol buffer of the above specified type.
-  bytes value = 2;
-}
diff --git a/quiche/blind_sign_auth/proto/attestation.proto b/quiche/blind_sign_auth/proto/attestation.proto
index 7ab2f56..1e1a774 100644
--- a/quiche/blind_sign_auth/proto/attestation.proto
+++ b/quiche/blind_sign_auth/proto/attestation.proto
@@ -16,7 +16,7 @@
 
 package privacy.ppn;
 
-import "quiche/blind_sign_auth/proto/any.proto";
+import "google/protobuf/any.proto";
 
 option java_multiple_files = true;
 option java_outer_classname = "AttestationProto";
@@ -117,5 +117,5 @@
 }
 
 message AttestationData {
-  quiche.protobuf.Any attestation_data = 1;
+  google.protobuf.Any attestation_data = 1;
 }
diff --git a/quiche/blind_sign_auth/proto/public_metadata.proto b/quiche/blind_sign_auth/proto/public_metadata.proto
index 31b993b..a57728b 100644
--- a/quiche/blind_sign_auth/proto/public_metadata.proto
+++ b/quiche/blind_sign_auth/proto/public_metadata.proto
@@ -16,7 +16,7 @@
 
 package privacy.ppn;
 
-import "anonymous_tokens/proto/anonymous_tokens.proto";
+import "google/protobuf/timestamp.proto";
 
 option java_multiple_files = true;
 option java_package = "com.google.privacy.ppn.proto";
@@ -43,7 +43,7 @@
   string service_type = 2;
 
   // When the token and metadata expire.
-  anonymous_tokens.Timestamp expiration = 3;
+  google.protobuf.Timestamp expiration = 3;
 
   // Indicates the debug context of this payload.
   enum DebugMode {